LINGERIE tycoon Michelle Mone has put her bitter divorce behind her to congratulate her ex-husband on his engagement to the woman she accused him of having an illicit affair with.

Ms Mone’s 20-year marriage to Michael ended in acrimony in November 2011.

She claimed the bust-up cost her £24million to buy him out of the Ultimo lingerie business they founded in 1996. The mother-of-three accused him of having an affair with Ultimo designer Samantha Bunn, 34.

It was claimed Ms Mone hired private investigators to track the pair when they travelled abroad on Ultimo business. Mr Mone, 47, has always insisted his relationship with his wife was over before he started seeing Miss Bunn.

Now Ms Mone, 43, has taken to Twitter to offer congratulations to the couple.

Mr Mone declined to comment on the good wishes but sources said last night that he had been engaged since September.

One said: “Michael got engaged to Samantha in September and it was assumed Michelle knew.

“Her announcement on Twitter has left some people scratching their heads and wondering what it is really all about.”

The former model said she spent 18 months “crying a lot”.

Their £3million home in Thorntonhall, Lanarkshire, was put on the market.

Last month it emerged that Ms Mone, who was awarded an OBE for her contribution to business in 2010, has sold off most of her final stake in the underwear business, having already sold a majority share to lingerie giants MAS Holdings.